Dear Mattioli,, Normally we apply an infinitesimal value of U with a finite one for alpha, do you mean that we do apply the converged value of U ( for example 2.5 ev for W from conventional cell ) in stead, and continue with standard procedure to determine the new U (U_out) ?? -- Youssef Aharbil, Laboratory of Physics and Chemistry of Materials Faculty of sciences Ben msik, Casablanca Morocco
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